Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o valor para Arizona quando Colorado e Nevada são Nixon, e Texas é Humphrey?
 ###Tabelas: CREATE TABLE round_and_draw_dates (round_and_draw_dates_id AUTO_INCREMENT PRIMARY KEY, Phase VARCHAR, Round VARCHAR, Draw date VARCHAR, First leg VARCHAR, Second leg VARCHAR) CREATE TABLE politics_of_the_southwestern_states (politics_of_the_southwestern_states_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Arizona VARCHAR, California VARCHAR, Colorado VARCHAR, Nevada VARCHAR, New Mexico VARCHAR, Oklahoma VARCHAR, Texas VARCHAR, Utah VARCHAR) CREATE TABLE house_of_oldenburg (house_of_oldenburg_id AUTO_INCREMENT PRIMARY KEY, Birth VARCHAR, Marriage VARCHAR, Became Consort VARCHAR, Ceased to be Consort VARCHAR, Death VARCHAR, Spouse VARCHAR) CREATE TABLE chinese_taipei_women's_national_football_team (chinese_taipei_women's_national_football_team_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Venue VARCHAR, Score VARCHAR, Competition VARCHAR, Report VARCHAR) CREATE TABLE runners_and_betting (runners_and_betting_id AUTO_INCREMENT PRIMARY KEY, Starting price VARCHAR, Number INT, Name VARCHAR, Age INT, Weight (st, lb) VARCHAR, Jockey VARCHAR, Trainer VARCHAR, Owner VARCHAR, Colours VARCHAR)  
SELECT Arizona FROM politics_of_the_southwestern_states WHERE Colorado = nixon AND Nevada = nixon AND Texas = humphrey